Hotel(hID, hName, city) primary key is hID Guest(gID, gName, gAddress) primary key is gID Room(hID, rNumber, price) primary key is (hID, rNumber). hID is a foreign key to Hotel relation Book(gID, hID, rNumber, StartDate, EndDate) primary key is all attributes! (hID, rNumber) is a foreign key to Room relation gID is a foreign key to Guest relation. Write in relational algebra the following queries: Select guests who stayed at least 1 day in New York City hotels between September 8, 2001, and September 11, 2001. Select guests who have never booked a room in the same hotels that John Doe has.

Q: Display employees (by name and address) from "Chicago" and with an annual salary between 60000…

A: The database management system is a collection of data and information and SQL languages are used…

Q: A attribute in a relation is a foreign key if the _______ key from one relation is used as an…

A: A foreign key is a key used to link two tables together. This is sometimes also called as a…

Q: Atuple in a database is: A A field. A record, An entity. A relation C D

A: A tuple is a row also known as one record stored in table.

Q: A relation cannot have: Multi-values attributes Several super-keys O Composite attributes Attributes…

A: Answer:

Q: TRUE or FALSE - A super-entity can only have two sub-entities and no more.

A: A SUPER-ENTITY CAN HAVE MORE THAN TWO SUB-ENTITES

Q: Using this unnormalized table and the five functional dependencies and third normal forms. In other…

A: To find the normal forms for the given functional dependencies, we need to check each normal form…

Q: Convert all relations to third normal form, if necessary, and draw a revised relational schema.

A: Given: Convert all relations to third normal form, if necessary, and draw a revised relational…

Q: An attributes in a relation coming from another relation is called: * O foreign key fields…

A: An attributes in relation coming from another relation is called

Q: Department: (DID, Department_Name, City, budget) Works IN: (EID, DID, Annual_Salary, Start_Date)…

A: T1: π(Employee_name, Annual_Salary) (Employee ⨝(Employee.EID = Works_IN.Employee_ID) Works_IN…

Q: The primary key and the candidate key must be distinguished.

A: Primary key The phrase main key refers to a candidate key that the database designer selects as the…

Q: The Car Maintenance team also wants to store the actual maintenance operations in the database. The…

A: DELETE CASCADE: - When we constitute a foreign key using this option, it deletes the referencing…

Q: Employee: (EID, Name, City, Address) Department: (DID, Department_Name, City, budget) Works IN:…

A: All the above details that are mentioned above in the question we will take to solve the question:…

Q: Explain references the primary key in the same relation?

A: The primary key constraint is that each row in the relational database management system table is…

Q: How does a relation's primary key affect its attributes' functional dependencies?

A: Introduction: Relational databases are widely used in modern computing systems to store and manage…

Q: Q1. Create these two relations, then insert the tuples. (Instructor relation: ID is PK, dept_name is…

A: Answer

Q: What is the binary relationship?

A: Binary relationship A Binary Relationship is a relationship between two different Entities which…

Q: What are the references to the main key in the same relation?

A: Introduction: The primary key constraint requires that each row in the relational database…

Q: # Question 1 #Using the World database, in the city table, insert a new city for the Tasmania…

A: What is SQL: SQL is a language for interacting with databases. SQL is the standard language for…

Q: is the number of attributes/fields in a relation. a. Degree b. Cardinality O c. Tuple d. Row

A: Degree: In DBMS, degree is the number of attributes or column present in the table Cardinality: In…

Q: What is the meaning of the primary key?

A: A primary key, sometimes known as the main keyword, is a unique identifier for each entry in a…

Q: Indicate all the functional dependencies and the normal form for each relation

A: The functional dependencies are the unique relationships between the attributes. For the table given…

Q: What data types would you use for the attributes in this entity? How would you code a CREATE TABLE…

A: In a database management system (DBMS), an attribute is a piece of data that describes an entity.…

Q: A prospective key is a component of a composite primary key.

A: One primary key is a composite one.   The primary key in database management systems consists of two…

Q: Question 7 Match a user request with the correct Express handler 1. app out product, fu Anna needs…

A: Lets see the solution.

Q: 13. Which one of the following uniquely identifies the elements in the relation? a. Secondary Key b.…

A: Given options -  a. Secondary Key b. Primary key c. Composite key d. Foreign key

Q: What distinguishes a primary key from a candidate key or a superkey?

A: Distinguishing between the words primary key, candidate key, and super key

Q: Transform the ER Diagram given above into Relational Schemas.

A: Relationship between Library and Book is 1:M. So we need to include primary key of Library into…

Q: 19. The ______ is the one in which the primary key of one relation is used as a normal attribute in…

A: Referential relation is the relationship that can be defined between two tables using common…

Q: Indicate all the functional dependencies and the normal form for each relation. Decompose your…

A: Indicate all the functional dependencies and the normal form for each relation. Decomposeyour…

Q: How do primary key, candidate key, and superkey differ?

A: In the context of relational databases, a primary key, candidate key, and superkey are all used to…

Q: Which non-key attribute does the main key relate to, if any, based on the value of some other…

A: Functional dependence is the relationship between any two properties. For instance, a relationship…

Q: A relation that has no transitive dependencies is in __________ normal form.

A: Normalization  in DMBS :  In designing the database, there is a requirement to remove all the types…

Q: Draw the arrow diagram for the following relation. The domain of relation is a group of four friends…

A: SOLUTION -     Given that in a given domain which consists of four friends, there is a relation H.…

Q: What is a primary key, and how is it defined?

A: Tip A primary key, sometimes known as a main keyword, is a unique identifier for each entry in a…

Q: A ternary relationship is a relationship which includes Select one: O a. Two entities O b. Three…

A: In unary relationship, only one type of entity participate in that relationship.   In binary…

Procedures in SQL

A pre-compiled stored procedure is a logical unit made up of one/more SQL statements (SQL stands for Structured Query Language). The database server saves it as an object. An SQL procedure is a collection of SQL statements and logic that is written and saved to accomplish a specified goal. An SQL procedure consists of a name, a parameter list, and a set of Transact-SQL statements. Stored procedures are stored as named objects in SQL Database Server.